Abstract: Lidar (Light detection and ranging) discrete-return point cloud data are available in the American Society for Photogrammetry and Remote Sensing (ASPRS) LAS format. The LAS format is a standardized binary format for storing 3-dimensional point cloud data and point attributes along with header information and variable length records specific to the data. Millions of data points are stored as a 3-dimensional data cloud as a series of x (longitude), y (latitude) and z (elevation) points. A few older projects in this collection are in ASCII format. Please refer to http://www.asprs.org/Committee-General/LASer-LAS-File-Format-Exchange-Activities.html for additional information.

Purpose: High-resolution digital elevation maps generated by airborne and stationary LiDAR have led to significant advances in geomorphology, the branch of geoscience concerned with the origin and evolution of Earth's surface topography. LiDAR provides unique characteristics relative to other remotely sensed data sources by providing three-dimensional feature information that cannot be derived from traditional imaging sensors.

Supplemental Information: {"gdaId" : 9330670}

Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 20151115

Ending Date: 20160330

Currentness Reference: publication date

Status:

Progress: Complete

Maintenance and Update Frequency: None planned

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -78.5449267105911

East Bounding Coordinate: -78.527530690236

North Bounding Coordinate: 38.1711389830273

South Bounding Coordinate: 38.1574045118923

Keywords:

Theme:

Theme Keyword Thesaurus: ISO 19115 Topic Category

Theme Keyword: elevation

Theme:

Theme Keyword Thesaurus: NGDA Portfolio Themes

Theme Keyword: Elevation

Theme:

Theme Keyword Thesaurus: National Elevation Dataset (NED)

Theme Keyword: National Elevation Dataset

Theme Keyword: NED

Theme Keyword: Elevation

Theme Keyword: LIght Detection And Ranging

Theme Keyword: LIDAR

Theme Keyword: High Resolution

Theme Keyword: Topographic Surface

Theme Keyword: Topography

Theme Keyword: Terrain Elevation

Theme Keyword: Cartography

Theme Keyword: DEM

Theme Keyword: Digital Elevation Model

Theme Keyword: Digital Mapping

Theme Keyword: Digital Terrain Model

Theme Keyword: Geodata

Theme Keyword: GIS

Theme Keyword: Mapping

Theme Keyword: USGS

Theme Keyword: U.S. Geological Survey

Theme:

Theme Keyword Thesaurus: The National Map Type Thesaurus

Theme Keyword: Downloadable Data

Theme:

Theme Keyword Thesaurus: The National Map Theme Thesaurus

Theme Keyword: Elevation

Theme:

Theme Keyword Thesaurus: The National Map Collection Thesaurus

Theme Keyword: Lidar Point Cloud (LPC)

Theme:

Theme Keyword Thesaurus: The National Map Product Extent Thesaurus

Theme Keyword: Varies

Theme:

Theme Keyword Thesaurus: The National Map Product Format Thesaurus

Theme Keyword: LAS

Place:

Place Keyword Thesaurus: Geographic Names Information System

Place Keyword: US

Place Keyword: United States

Place:

Place Keyword Thesaurus: The National Map Place Thesaurus

Place Keyword: US

Access Constraints: None. Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.

Use Constraints: There is no guarantee or warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since these data were collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the USGS. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.

Data Set Credit: Acknowledgement of the originating agencies would be appreciated in products derived from these data.

Data Quality Information:

Attribute Value Accuracy Information:

Attribute Accuracy Report: Data are provided in las format version LAS 1.4. Header attributes and point attribute for LAS files can be found on ASPRS website listed below. USGS not making any promises on the accuracy or completeness of the attribute information.

Logical Consistency Report: Please refer to the Metadata Section at the end of this document for a live link to a copy of the original data source's metadata file if one was provided.

Completeness Report: The lidar collection has been acquired by the USGS through contracts, partnerships with other Federal, state, tribal, or regional agencies, from direct purchases from private industry vendors, and through volunteer contributions from the science community. While USGS makes every effort to provide accurate and complete information, USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished lidar point clouds. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

Entity and Attribute Overview: The attributes for LAS is described in LAS specifications.

Entity and Attribute Detail Citation: A link to the LAS specifications describing information that is included for the LAS file and each point record it contains is provided at the end of the Metadata Section of this document.

Distribution Liability: Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implied, is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. The USGS will warranty the delivery of this product in computer-readable format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustments of credit must be made within 90 days from the date of this shipment from the ordering site.